Rock drill



F. M. SLATER Rocx DRILL Aug. 21, 192s.

' Filed Nov. 18,` 1926 E X f w v INVENTon ["11 d MJffl' mSATTo EY.

Patented` Aug. "21,` '1928. Y

PATENT OFFICE.: 1

FEED M. sLA'rER,` or EASTON, PENNSYLVANIA, AssiGNon :roI yrNsEEsOLE-anim com- PANY, or JERSEY CITY, NEW JERSEY, ArconronnrIoN or NEWJEESEY,

. noci:1 DRILL.

Application filled November 18; 1926.. SeralNo. 14951728.v

This invention relates towrock drills, but more particularlyto a'spring pressed valve block forming a seat for thel distributing valve `of fluid Vactuated rockV `drills of the hammer type. Y :Y

:The objects of theinvention are. to secure the valve block inoperative position inf an improved and simplified manner and toireduce the cost of manufacturing the constituent parts of the valve chest.

VOther objectswill bein part* obvious and o in part pointed out hereinafter. i

The invention consistsof the combination of elements `and arrangement: of partsfsubstantially asl hereinafter described and :claimed and illustrated in the accompanying drawings, in which: i n

Figure 1 is a sectional elevation of so much of a rock drill as willserve to illustrate Vthe invention, Figure 2 isl a sectional elevation taken through Figure 1` on the line 2 2 lookingin `the direction of the arrows, and

Figure 3 is a plan viewfpartlyin section taken through Figure 2onf the line 3-3 looking inthe direction of the arrows.

' `Referring to the" drawings,the invention is M4shown embodied in a'rock: drill havinga 'cylinder A, only thel rearward portion of which is shown for illustrative, purposes.v Front and rearward inlet passages B and@ Vi'espectively are formed in the @vlinder to deliverpressure iluidto the end of the cylinder for impelling the hammerA piston D disposed within a piston chamber E.. y At the rearward end ofthe piston chamber E and forming a continuationy thereof is an enlarged bore F. Inthe frontend of said bore is disposed a back cylinden washer G which forms a closure. for the rearward `end'of the .piston chamber E.' A- rifle bar `H'entends through an aperture J of' the "back cylinder washer Gand engages the piston D in the usual manner for rotating the working implement" (not shown) against which the hammer piston `delivers its blow. The rifle bar yH isprovided.` with the usual. head K which carries spring pressed pawl members L adapted to engage a toothed ratchet'ring Ol which `encircles the head K and is seated on the rearward face of the back cylinder washer GQ A valve block P disposed in the rearward end ofthe bore F is seated on the ratchet ring O and the head Kof the rifle bar H andf has a pair of supply passages Q and R which lead from a seating surface S of the valve Ablock P to register with the front and4 rearward inlet passages-'Band C respectively.. The valve block P and rotation ratchet O andthe back cylinder washer G are in this instance held against rotation in the bore F by a key orfpin T disposedtin slots IU form'edin the members intended to be keyed together.` y

Disposed at the rearwardend ofthe cylinder A is a back head V preferably clamped Y.

to the cylinder luy-side bolts W and? is -provided on Vits inner face withV an annular flange X which extends into the `bore F.' The i flange X is preferably only of` Vsufficient length' to centralize the back head with respect tothe cylinder. A connection leading from a suitable source of pressure Afluid supply is connected to thebackfheadV and communicates with'an annulariefess Zin the inner face of the back; head through a `passage b for delivering pressure fluid toa valve chamberjc formed `bythe valve block Pandthe backheadV; i The distribution of such pressure fluid to may be pivoted inthe chamber cin any suitable manner. In the'present instance this is accomplished by means of a sleeve e through which extends awater tube V. kThe sleeve `e is preferably seated atwone end fin the back head-V and. atits block .PL- y ,Y

Inl drills of the type toi which the: present invention is applied, .it hasheretofore been` other-` end in the valve customary to' form the flange'tXofa length tovpermituits inner face Atoabut the" valve block Px for the purpose ofclamping said `valve blockin operativeposition. j Such construction, however, has been found t-orhefexpensive for the reason that-considerable vtiini 4and skill is required in properly machining il with ,forwardly extending lribs f ysuitably spaced to .form a slot g therebetween'for the reception of a plate spring z. havingiii' this instance an arcuate intermediate portion which bears against the roof of the slot g. At the ends of the spring are formed reversely curved portions 7c which press against the seating surface S to hold the valve block P and, in the construction shown, the ratchet ring O and the back cylinder washer G against longitudinal movementin thebore F in a rearwardly direction. In the present instance the spring h has a central aperture 0 through which the sleeve e extends for preventing endwise movement of the spring.

By means of the present invention a considerable saving is effected in the cost of the construction and operation of rock drills of the type to which the present invention may be applied. This construction eliminates the necessity of machining the parts disposed in the bore F to accurate tits and enables suoli parts to be readily removed from the bore l." for the purposes of inspection and replacement of parts.

I claim:

l. In a fluid actuated rock drill the combination of a cylinder having a piston chamber with an enlarged bore at. one end, a valve block in the bore, a hack head for the cylinder cooperating with the valve block to form a valve chamber, means extending through the valve chamber for conveying cleansing fluid through the drill, and a spring in the valve chamber encirclingr the said meanspressing against the back head and the valve block to hold said valve block immovable in the bore.

2. In a fluid actuated rock drill, the combination of a cylinder having a piston chamber with an enlarged bore at one end, a valve block in the bore having a seating surtace, a back head for the cylinder cooperating with the valve block to form a valve chamber, a valve in the valve chamber resting on the seating surface, and a spring spanning the valve and in engagement with the seating surface and the back head to hold the said valve block against longitudinal movement with respect to the cylinder.

3. In a fluid actuated rock drill, the combination of a cylinder having a piston chamber with an enlarged bore at one end, a valve block in the bore, a back head for the cylinder cooperating with the valve blockto form a valve chamber, an oscillatoryy plate valve in the valve chamber, and a plate spring spanning the valve and in engagement with the back head and the valve block to hold the valve block immovable in the bore.

4. In a Huid actuated rock drill, the combination of a cylinder having a piston chamber with an enlarged bore at one end, a valve kbination of a cylinder having block in the bore, a back head for the cylinder cooperating with the valve block to form a valve chamber, means in the bore forming a seat for the valve block and a spring in the valve chamber pressing against the baclr` head and the valve block for holding the valve block and said means against longitu dinal movement with respect to the cylinder.

5. In a fluid actuated rock drill, the coinbination of a cylinder having a piston cham ber with an enlarged bore at one end, a valve block in the bore, a back head ior the cylinder cooperating with the valve block to forni a valve chamber, an oscillatory plate valve in the valve chamber, and an arcuate plate spring in the chamber disposed at right angles to the valve, the intermediate arcuate portion of the spring being seated on the back head and the ends of the spring on the valve block for holding said valve block in operative position.

(l. In a liuid actuated rock drill, the combination of a cylinder having a piston chamber with an enlarged bore at one end. a valve block in the bore, a back head for the cylinder cooperating with the valve block to form a valve chamber, an oscillatory plate valve in the valve chamber, and a spring in the chaniber spanning the valve at right angles thereto, said spring comprising an intermediate curved portion seated on the back head and rcversely curved end portions seated on the valve block to hold the valve block securely in assembled position.

7. In a. fluid actuated rock drill the combination of a cylinder having a piston eliambei' with an enlarged bore at one end, a back head for the cylinder having a slot across its inner end face, a valve block in the bore cooperating With the back head to form a valve chamber, an oscillatory plate valve in the valve chamber, and a plate spring spanning the valve atrright angles thereto, said spring comlirising an intermediate curved portion seated in the slot and reverscly curved end portions bearing on the valve block to hold the valve block immovable in the bore.

8. In a (luid actuated rock drill, the coma bore, a valve block in the bore` a back head on the cylinder cooperating with the valve block to form a valve chamber, and a spring in the valve chamber exerting a pressure on the valve block for holding said valve block immovable in the bore.

In testimony whereof I have signed this specication.

FRED M. SLATER. 

